To "cry crocodile tears" is a common expression used for depicting fake sadness. Crocodiles really do weep while feasting, but not due to remorse. Their eyes can froth and bubble during the feeding. Air pushed through the sinuses could mix with tears in the animal's tear glands, and the whole content could be emptied into the eye, resulting in the tears.
Scary Crocodile smiling. What a great post! We just absolutely love animals. Whether it's a dog, cat, bird, horse, fish, or anything else, animals are awesome! Don't you agree? -- courtesy of www.canoodlepets.com